Chain shortener



FIG. 1 is a perspective view of a chain softener, showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a right side elevational view, the opposite side being a mirror image thereof; and

FIG. 5 is an end elevational view taken along line 5--5 in FIG. 1. 

The ornamental design for a chain shortener, as shown and described. 